Don't attempt to change globaldrawer properties if it's not loaded yet

src/qml/main.qml

@@ -40,6 +40,7 @@ Kirigami.ApplicationWindow {
     }
 
     function changeNavigation(isNarrow) {
+        if (globalDrawer) {
             if (isNarrow) {
                 globalDrawer.collapsed = true
                 globalDrawer.width = Layout.implicitWidth
@@ -48,6 +49,7 @@ Kirigami.ApplicationWindow {
                 globalDrawer.width = originalWidth
             }
         }
+    }
 
     function getPage(page) {
         switch (page) {